Hugo Award Winning John Schoenherr – “Dune World” (1963). One of the GREAT science fiction writers of the 20th century. See The Illustrated Dune (also here from Omni magazine article) for more interesting Dune art. Schoenherr lived from 1935-2010.
Get your mind out of the gutter, it’s NOT phallic art.
ALSO SEE: 
